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    <title>Document</title>
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    <style>
        .table tr th{
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  <body>
    
    <table class="table">
        <thead class="thead-dark">
          <tr>
            <th scope="col">序列号</th>
            <th scope="col">姓名</th>
            <th scope="col">年龄</th>
            <th scope="col">成绩</th>
          </tr>
        </thead>

        <tbody>
          <tr>
            <th scope="row">1</th>
            <td>Mark</td>
            <td>Otto</td>
            <td>@mdo</td>
          </tr>
        </tbody>
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